See, I don't understand that. I didn't put my little one in any special pre-pre-schools. She just went off to kindergarden. Well, here we are at the end of kindergarden and she's doing wonderfully. She writes very nicely, she can count to any number, she can tell time (just the hours, half hours and quarter hours so far!), she can read all kinds of words and does good sounding out others. She sits and reads books to me all the time and does really well. She knows SO much more than when she started last fall. She knows basic math... it's amazing. And it's not just her...her classmates I've been around have learned just as much with no "prep" work.
Her kindergarden (public school) taught her PLENTY! You don't have to go into kindergarden knowing how to read and write. All you need to know is your alphabet, how to write your name, basic colors, shapes and count 1-10. Honestly, they expect the parents to put some effort into helping too, but of course you should.